Improvement in casting bottoms on sheet-metal vessels



R. J.. HW D0 N.

Casting Bottoms un Sheet-Metal Vessels..

N0.137,204. PatentedMarch25,l873.

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ROBERT J. HOWDON, OF CINCINNATI, OHIO.

IMPROVEMENT IN CA ST|NG BOTTOMS ON SHEET-METAL VESSELS.

Specification forming part of Letters Patent No. 137,204, dated March25, 1873.

To all whom t may concern:

Beit known that I, ROBERT J. HowDoN, of Cincinnati, in the county ofHamilton and State of Ohio, have invented a certain new and usefulImprovement in Casting Bottoms to Sheet-Metal Vessels, of which thefollowing is a specification:

Nature cmd Objects of Invention.

My invention relates to the formation of cast-metal bottoms forsheet-metal vessels, when the bottom is cast directly upon the vessel;and consists, first, of a construction of the pattern which enables thesand `to be smoothly and entirely cleaned from around the lower edge ofthe vessel upon which the bottom is to be cast, and insures a thoroughand perfect tting of the casting to the sheet metal inside and outaround the projections of the. vertical joints, &c. and, second, of adevice for the patterns for tea-kettles and such vessels as have spouts,which enables the smooth casting of the metal bottom so as to embracethe junction of the spout and vessel in one piece.

Description of tzcAccompcng/ng Drawing.

Figure l is a vertical section through a flask and its cope, showing apattern embody ing the first part of my invention in position upon thelower edge of a sheet-metal vessel. Fig. 2 is a vertical section of thesame, showing a pattern embodying the second part of my invention asapplied to a tea-kettle. Fig. 3 is a plan, showing a vertical joint ofthe sheet metal in the side of a vessel with a pattern embodying myinvention surrounding it. Fig. 4 is an elevation of that portion of thepattern which embodies the second part of my invention.

General Description. A is the main body of a'iiask, of which B is thecope. C is the body of a kettle or other sheet-metal vessel placed inthe sand, and D is the pattern for the casting, constructed as follows Dis the circular disk, shaped to any preferred form of bottom, whosecircumference d sits closely upon the lower edge of the sheet metalprojecting slightlyover it. It has a raised circular ange or rim, c,whose outside is perpendicula-r to its plane at the edge of the vessel,and presses closely against the inner surface of the sheet metal.Surrounding this disk is a ring, f, the inner edge of which is fitted tothe edge of the disk and surrounds the sheet metal on the outside atadistance regulated by the projection of the disk over the metal. Inremoving the cope after the formation of the mold this ring f, fittingloosely, is either lifted off with the cope or removed separately. Thepattern D, whose iiange e fits tight to the inner surface of the sheetmetal, requires to be pried off by. any suitableinstrument, after whichthe loose sand around the edge is cleaned away. The projection of thecircumference d over the edge furnishes a space between the metal andthe ring f, which space z, Fig. 5, is necessary to prevent theinterference ofthe ring with the vertical joints h of the metal, butwhen the loose sand iillin g this annular space is cleaned away themolten metal will flow closely around said joints in the casting, andthe tight fitting of the flangec inthe inside enables a much neaterfitting in that respect of the casting than if the pattern was made inone piece, which, if fitted with equal closeness, would in its removaltend to lift the vessel itself from the mold, and shake a-nd injure thesurfaces of the sand. In casting the bottom so as to embrace the base ofthe spout of a tea-kettle or similar vessel, as in Figs. 2 and 4, thering fis formed with an ear, F, and the cope and iiask are arrangedcorrespondingly, as in Fig. 2. This ear F extends as high as the centerof the spouts base (Fig. 4) and has a semi` circular recess to iitaround it. The upper side of the spout is flattened, giving it atriangular or A-shaped ycross-section, and the ea F is extended aroundit by means of two straight supplementary strips, 13 i', which areremoved after the ring is lifted olf by being drawn out in the directionof their length.

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2. In combination with the elements of the' first clause, the ear F andsupplementary strips i i', substantially as and for the purposedescribed. j

In testimony of which inventionI hereunto set my hand. A

ROBERT J. HOWDON. Witnesses:

FRANK MILLWARD,

J. L. WARTMANN.

